Collinder 221
(VDBH 96; NGC 3255; OCL 817; vdBergh-Hagen 96; ESO 127 20; FSR 1546; MWSC 1804)
0.91
UTI
0.79
CN
1.0
Cdens
1.0
CC3
0.87
Clit
1.0
Cdup
Stellar density (N50/rad)
40.2 [N/pc2]
- CN 0.79 Rich
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.87 Well-studied
- Cdup 1.0 Unique
π₯ Members
π Colab
π¬ Bayestar19
MOCA
π CDS
π Simbad
π CDS (Ξ±, Ξ΄)
π Simbad (Ξ±, Ξ΄)
MOCA
π CDS
π Simbad
π CDS (Ξ±, Ξ΄)
π Simbad (Ξ±, Ξ΄)
Overview
Collinder 221 is a rich, very dense object of very high C3 quality. Its parallax locates it at a large* distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is well-studied in the literature.
(*): The parallax distance estimate (~7.14 kpc) differs significantly from the median photometric distance (~4.78 kpc).
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999β | 156.635 | -60.674 | 0.14 | -5.898 | 3.32 | 21.178 |
| Li et al. | 2025 | 156.635 | -60.675 | 0.12 | -5.913 | 3.322 | β |
| Hu & Soubiran | 2025 | 156.637 | -60.673 | β | β | β | β |
| Almeida et al. | 2025 | 156.633 | -60.676 | β | β | β | β |
| Hunt & Reffert | 2024 | 156.637 | -60.672 | 0.155 | -5.887 | 3.313 | 12.109 |
| Cavallo et al. | 2024 | 156.637 | -60.674 | 0.155 | β | β | β |
| Hunt & Reffert | 2023 | 156.637 | -60.672 | 0.155 | -5.887 | 3.313 | 12.109 |
| Almeida et al. | 2023 | 156.634 | -60.676 | β | β | β | β |
| Dias et al. | 2021 | 156.633 | -60.676 | 0.116 | -5.905 | 3.314 | β |
| Cantat-Gaudin et al. | 2020 | 156.635 | -60.675 | 0.12 | -5.913 | 3.322 | β |
| SΓ‘nchez et al. | 2020 | 156.629 | -60.677 | β | -5.934 | 3.371 | β |
| Cantat-Gaudin & Anders | 2020 | 156.635 | -60.675 | 0.12 | -5.913 | 3.322 | β |
| Soubiran et al. | 2018 | 156.635 | -60.675 | β | β | β | 22.03 |
| Bica et al. | 2019 | 156.637 | -60.673 | β | β | β | β |
| Cantat-Gaudin et al. | 2018 | 156.635 | -60.675 | 0.12 | -5.913 | 3.322 | β |
| Dias et al. | 2014 | 156.629 | -60.677 | β | -3.03 | 0.52 | β |
| van den Bergh | 2006 | 156.625 | -60.667 | β | β | β | β |
| Dias et al. | 2002 | 156.629 | -60.677 | β | -4.4 | -2.08 | β |
π‘ Note: The UCC values are estimated from its identified members.
| Reference | Year | Dist [kpc] | Av [mag] | DAv [mag] | Age [Myr] | [Fe/H] [dex] | Mass [Msun] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999β | 4.78 | 1.03 | 1.7 | 352 | -0.150 | 992 | 0.64 | β |
| Li et al. | 2025 | 4.78 | 1.04 | β | 525 | -0.150 | β | β | β |
| Hu & Soubiran | 2025 | β | β | β | β | -0.190(5) | β | β | β |
| Almeida et al. | 2025 | 4.43 | 1.03 | β | 515 | β | 892 | β | β |
| Hunt & Reffert | 2024 | β | β | β | β | β | 1873(1) | β | β |
| Cavallo et al. | 2024 | 3.56 | 1.31 | β | 724 | -0.430 | β | β | β |
| Hunt & Reffert | 2023 | 5.48 | 1.17 | 1.70 | 262 | β | β | β | β |
| Almeida et al. | 2023 | 4.78 | 1.30 | β | 352 | -0.036 | 992(1) | 0.64 | β |
| Dias et al. | 2021 | 4.43 | 1.03 | β | 515 | 0.007 | β | β | β |
| Cantat-Gaudin et al. | 2020 | 5.47 | 0.92 | β | 224 | β | β | β | β |
| Cantat-Gaudin & Anders | 2020 | 6.70 | β | β | β | β | β | β | β |
| Soubiran et al. | 2018 | 6.70 | β | β | β | β | β | β | β |
| Cantat-Gaudin et al. | 2018 | 6.70 | β | β | β | β | β | β | β |
| van den Bergh | 2006 | 1.45 | 0.78 | β | 200 | β | β | β | β |
| Dias et al. | 2002 | 1.45 | 0.78 | β | 200 | β | β | β | β |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Almeida et al. (2025)
Mass determination: good fit. Isochrone match: intermediate fit. Silver sample.
Cavallo et al. (2024)
Gold sample.